M2 bottle is not relocatable

[mahrud]

Currently bottles for M2 are not relocatable on x86_64_linux only because of the following offenses:

==> Detecting if macaulay2--1.21_2.x86_64_linux.bottle.tar.gz is relocatable...
Warning: String '/home/linuxbrew/.linuxbrew/opt' still exists in these files:
/home/linuxbrew/.linuxbrew/Cellar/macaulay2/1.21_2/bin/M2-binary
 --> match '/home/linuxbrew/.linuxbrew/opt/libatomic_ops/include' at offset 0xcaaa2cc
 --> match '/home/linuxbrew/.linuxbrew/opt/gmp/include' at offset 0xcaab4d3
 --> match '/home/linuxbrew/.linuxbrew/opt/mpfr/include' at offset 0xcaab4fe
 --> match '/home/linuxbrew/.linuxbrew/opt/mpfi/include' at offset 0xcaab52a
 --> match '/home/linuxbrew/.linuxbrew/opt/gdbm/include' at offset 0xcaabb7f
 --> match '/home/linuxbrew/.linuxbrew/opt/libffi/include' at offset 0xcab1e52

This might be fixed by stripping the binary (which might also explain why the size of the binary on linux is almost 2x as large as on macos).

The benefit of relocatable bottles is that brew would not rebuild from source in situations like this: #176